[math] AbstractDescriptive Statistics

[Mark R. Diggory]

I'm curious about AbstractDescriptiveStatistics, currently our Type 
Hierarchy looks like this:

Object
    --> DescriptiveStatistics (implements Statistical Summary)
              --> AbstractDescriptiveStatistics
                           --> DescriptiveStatisticsImpl
                           --> ListUnivariateImpl
                                        --> BeanListUnivariateImpl
Why don't we consolidate AbstractDescriptiveStatistics into 
DescriptiveStatistics? Then we will have

Object
    --> DescriptiveStatistics (implements StatisticalSummary)
              --> DescriptiveStatisticsImpl
              --> ListUnivariateImpl
                           --> BeanListUnivaraiteImpl
Which is much more similar to the SummaryStatistics Hierarchy
Object
    --> SummaryStatistics (implements StatisticalSummary)
              --> SummaryStatisticsImpl
Likewise, for consistency, we should probibly rename ListUnivariateImpl 
and BeanListUnivariateImpl to ListDescriptiveStatisticsImpl and 
BeanDescriptiveStatisticsImpl

If no one has objections, I can make the changes.
-Mark
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